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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q133-Q138):

NEW QUESTION # 133
A switch receives a frame with a MAC address of FF-FF-FF-FF-FF-FF.
Which action will the switch take on this frame?

A. It will flood it out of all interfaces, except for the directly connected VLAN.
B. It will flood it out of all interfaces.
C. It will flood it out of all interfaces, except for the next-hop interface.
D. It will flood it out of all interfaces, except for the ingress interface.

Answer: D

Explanation:
A MAC address of FF-FF-FF-FF-FF-FF is the Ethernet broadcast address. When a switch receives a frame with this destination MAC address, it is required to forward the frame to all interfaces except the one it was received on.
Step-by-Step Breakdown: Broadcast Frame Handling:
When a frame with the broadcast MAC address is received, the switch will flood it out of all active ports that belong to the same VLAN as the incoming frame. The broadcast frame is not sent back out of the ingress interface (the interface where the frame was originally received).
Purpose of Flooding:
Broadcasting is used to ensure that the frame reaches all devices within the broadcast domain (all devices within the same VLAN), which may not have a specific entry for the MAC address in their MAC address table.
Juniper
Reference: Layer 2 Frame Forwarding: Juniper switches flood broadcast frames to all ports in the same VLAN, except the port the frame was received on.

NEW QUESTION # 134
Under which Junos hierarchy is a static route configured?

A. system
B. routing-options
C. routing-instances
D. protocols

Answer: B

NEW QUESTION # 135
Within your router, you want to verify that you are learning routes from a remote BGP peer at IP address 10.10.100.1. Which command would satisfy the requirement?

A. show route protocol bgp source-gateway 10.10.100.1
B. show route receive-protocol bgp 10.10.100.1
C. show route protocol bgp table inet.0 10.10.100.1
D. show route advertise-protocol bgp 10.10.100.1

Answer: B

Explanation:
To verify that your router is learning routes from a remote BGP peer at a specific IP address (e.g., 10.10.100.1), the correct command to use is show route receive-protocol bgp.
Step-by-Step Breakdown:
BGP Route Learning:
The show route receive-protocol bgp command displays the routes that have been received from a specified BGP peer. This helps in confirming that the remote peer is sending routes correctly and that your router is receiving them.
Command Example:
show route receive-protocol bgp 10.10.100.1
This will show all routes that have been received from the BGP peer with IP address 10.10.100.1.
Juniper Reference:
BGP Route Verification: Use this command to troubleshoot and verify that routes from a specific BGP peer are being received.

NEW QUESTION # 136
What is the main advantage of using MACsec?

A. It increases the speed of the network.
B. It provides Layer 2 encryption for data confidentiality and integrity.
C. It allows for the use of longer cable runs.
D. It creates multiple virtual networks over a single physical infrastructure.

Answer: B

NEW QUESTION # 137
Which two statements describe an IP fabric? (Choose two.)

A. An IP fabric provides traffic load sharing.
B. An IP fabric allows devices to always be one hop away.
C. An IP fabric depends on Layer 2 switching.
D. An IP fabric uses spine and leaf devices.

Answer: A,D

Explanation:
An IP fabric is a network topology designed to provide a scalable, low-latency architecture that is typically implemented in modern data centers. It uses spine and leaf switches and enables efficient traffic load sharing across the network.
Step-by-Step Breakdown:
Spine-Leaf Architecture:
Leaf Devices: These switches connect to servers and edge devices within the data center. Each leaf switch connects to every spine switch.
Spine Devices: These high-performance switches interconnect all the leaf switches. There are no direct connections between leaf switches or spine switches. This architecture ensures that any two endpoints within the fabric are only one hop away from each other, minimizing latency.
Traffic Load Sharing:
An IP fabric leverages Equal-Cost Multipath (ECMP) to distribute traffic evenly across all available paths between leaf and spine switches, providing effective load balancing. This ensures that no single link becomes a bottleneck and that traffic is distributed efficiently across the network.
Juniper Reference:
Juniper provides QFX Series switches optimized for IP fabric topologies, allowing for scalable deployments in modern data centers.
EVPN-VXLAN: Often used in IP fabrics to extend Layer 2 services across the fabric with Layer 3 underlay, enabling both efficient routing and bridging.

NEW QUESTION # 138
......

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Zoe Reed Zoe Reed

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